$NetBSD$

--- configure.orig	2010-04-27 23:42:59.000000000 +0000
+++ configure
@@ -6813,7 +6813,7 @@ fi
 
 
 for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
-		  inttypes.h stdint.h unistd.h
+		  inttypes.h stdint.h unistd.h netinet/in.h netinet6/in6.h
 do
 as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
 { $as_echo "$as_me:$LINENO: checking for $ac_header" >&5
